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High-magnetism high-mechanical-strength bonded neodymium iron boron (NdFeB) permanent magnet and preparation method thereof

A technology with mechanical strength and high magnetic properties, applied in the fields of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of poor magnetism, poor mechanical strength, and high loss of grinding and molding, and achieve strong magnetism and service life of the magnet. Long, productive results

Inactive Publication Date: 2013-02-20
TIANJIN NIBBOH MAGNETS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is generally as follows: mixing NdFeB permanent magnet powder, bonding resin, processing aid and other components according to a certain ratio, and then pressing the mixed magnetic powder according to a certain processing method. The commonly used processing technology is mainly There are three types: compression molding, injection molding, and extrusion molding. After the magnet is cured, ground, and coated, it becomes a magnet of a certain shape. Its main components include NdFeB magnetic powder that provides magnetic properties and as a binder. Thermosetting resins, and processing aids such as curing agents, accelerators, coupling agents, lubricants, etc., but the magnets obtained by the existing methods have technical problems such as poor magnetic properties, poor mechanical strength, and high subsequent grinding, transportation, and molding losses.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A bonded NdFeB permanent magnet with high magnetic properties and high mechanical strength comprises NdFeB magnetic powder, thermosetting resin, curing agent and lubricant, and the magnetic powder contains metallocene polymer ferromagnetic powder and stainless steel powder. High magnetic and high mechanical strength bonded NdFeB permanent magnet composition: 1000g of quick-quenched NdFeB magnetic powder with a mass ratio of less than 100 mesh and 100-200 mesh with a mass ratio of 1:0.45, 100g of 325 mesh stainless steel powder, and metallocene polymer ferromagnetic powder (OPM) 180g, epoxy resin 46g, dicyandiamide curing agent 2.2g, zinc stearate 6g.

Embodiment 2

[0034] A method for preparing a bonded NdFeB permanent magnet with high magnetic properties and high mechanical strength, comprising the following steps:

[0035] (1) Mix thermosetting epoxy resin, curing agent and acetone 1-4 times the mass of thermosetting epoxy resin evenly;

[0036] (2) Use a mixer to mix NdFeB magnetic powder, metallocene polymer ferromagnetic powder with a mass of 7-23% of NdFeB magnetic powder and stainless steel powder with a mass of NdFeB magnetic powder of 3-17%;

[0037] (3) Add the mixture of step (2) to the mixture of step (1), and mix evenly with a mixer;

[0038] (4) Bake the obtained mixture at 80°C for 5-9 hours, the dried powder is sieved by a vibrating sieving machine, and finally a lubricant is added and mixed evenly to obtain the magnetic powder mixture of the present invention;

[0039] (5) The magnetic powder mixture is compressed into various shapes of magnet green bodies through a compression molding machine; the pressure of the compr...

Embodiment 3

[0042] Preparation of high magnetic and high mechanical strength bonded NdFeB permanent magnet: 1000g of quick-quenched NdFeB magnetic powder with a ratio of 1:0.45 between mesh number less than 100 mesh and 100 mesh to 200 mesh, 50g of 325 mesh stainless steel powder, and metallocene Polymer ferromagnetic powder (OPM) 150g, epoxy resin 36g, dicyandiamide curing agent 1.8g, zinc stearate 5g. Mix epoxy resin, dicyandiamide curing agent and acetone 1-4 times the weight of the resin evenly, then add the mixture of magnetic powder, metallocene polymer ferromagnetic powder (OPM) and stainless steel powder, and use a mixer to mix The above magnetic powder mixture and resin are fully stirred and mixed evenly. Then, the obtained mixture is baked at 80°C for 5-9 hours, the dried powder is sieved by a vibrating sieving machine, and finally a certain proportion of zinc stearate is added and mixed evenly to obtain the magnetic powder mixture of the present invention , The magnetic powder...

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PUM

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Abstract

The invention relates to a high-magnetism high-mechanical-strength bonded neodymium iron boron (NdFeB) permanent magnet and a preparation method thereof and belongs to the technical field of magnets. The high-magnetism high-mechanical-strength bonded NdFeB permanent magnet comprises NdFeB magnetic powders, a thermosetting resin, a curing agent and a lubricating agent, and the magnetic powders comprise metallocene macromolecule ferromagnetic powders and stainless steel powders. The preparation method includes firstly, evenly mixing the thermosetting resin, the curing agent and acetone; secondly, evenly mixing the NdFeB magnetic powders, the metallocene macromolecule ferromagnetic powders and the stainless steel powders; thirdly, adding a mixture obtained from the step two to a mixture obtained from the step one and evenly mixing the two mixtures; fourthly, performing drying and screening, adding the lubricating agent, and evenly mixing the mixtures to obtain a magnetic powder mixture; fifthly, using a compression molding machine to press the mixtures into a magnet green body; and sixthly, curing the magnet green body at the temperature of 175-200 DEG C to obtain the magnet. The magnet has the advantages of being convenient to prepare, high in magnetic property and mechanical strength, small in dimensional tolerance, convenient to subsequently barrel and grind and low in transportation and assembly loss of finished products.

Description

technical field [0001] The invention belongs to the technical field of magnets, in particular to a bonded NdFeB permanent magnet with high magnetic properties and high mechanical strength and a preparation method thereof. Background technique [0002] At present, bonded NdFeB permanent magnet is a new type of magnetic functional composite material obtained by compounding binder and NdFeB permanent magnet powder, and has broad application prospects. Various non-magnetic polymers such as epoxy resin, nylon, polyphenylene sulfide, polyethylene, rubber, etc. have been studied, and low melting point metals Bi, Sn, Pb, Zn, Al, etc. are used as binders to prepare and produce bonding. Permanent magnet materials, and put into practical application. [0003] Bonded NdFeB permanent magnets are widely used in computer hard drives, optical drives, game consoles, printers, Qiwu micro-motors, and magnetic sensors. The preparation method is generally as follows: mixing NdFeB permanent mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/057H01F1/08H01F41/02
Inventor 王利
Owner TIANJIN NIBBOH MAGNETS
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